8421265 has 8 divisors (see below), whose sum is σ = 10139688. Its totient is φ = 6714240.

The previous prime is 8421251. The next prime is 8421403. The reversal of 8421265 is 5621248.

It can be written as a sum of positive squares in 4 ways, for example, as 121104 + 8300161 = 348^2 + 2881^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8421265 - 2¹³ = 8413073 is a prime.

It is a Duffinian number.

8421265 is a lucky number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1126 + ... + 4255.

It is an arithmetic number, because the mean of its divisors is an integer number (1267461).

Almost surely, 2^8421265 is an apocalyptic number.

It is an amenable number.

8421265 is a deficient number, since it is larger than the sum of its proper divisors (1718423).

8421265 is a wasteful number, since it uses less digits than its factorization.

8421265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5699.

The product of its digits is 3840, while the sum is 28.

The square root of 8421265 is about 2901.9415914177. The cubic root of 8421265 is about 203.4506638666.

The spelling of 8421265 in words is "eight million, four hundred twenty-one thousand, two hundred sixty-five".